is there an air return in that heater room? if the air return is attached directly to the heater, it is noisy.
sometimes we put a box at the bottom, the noise bounced in that box (with sound insulation on the inside), it reduces much of the noice.
sometimes we put a box at the bottom, the noise bounced in that box (with sound insulation on the inside), it reduces much of the noice.
选择“Disable on www.wenxuecity.com”
选择“don't run on pages on this domain”
